# Input / output inpedance vs frequency chart / plot
**URL:** https://discourse.myriadrf.org/t/input-output-inpedance-vs-frequency-chart-plot/600
**Category:** LimeSDR
**Created:** [2 January 2017 22:03 UTC](https://discourse.myriadrf.org/t/input-output-inpedance-vs-frequency-chart-plot/600 "2017-01-02T22:03:04Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Kc7noa](https://discourse.myriadrf.org/u/Kc7noa)
#### Post date: [2 January 2017 22:03 UTC](https://discourse.myriadrf.org/t/input-output-inpedance-vs-frequency-chart-plot/600/1 "2017-01-02T22:03:04Z")
Is there a chart or response plot for the input / output impedance vs frequency ?
I was once told that the parts between the LMS7001 and the antenna connector was impedance matching and not a filter … though some sort of conversion from unbalanced to balanced signal is needed - 0deg and 180deg …
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### Author:  [@andrewback](https://discourse.myriadrf.org/u/andrewback)
#### Post date: [3 January 2017 14:06 UTC](https://discourse.myriadrf.org/t/input-output-inpedance-vs-frequency-chart-plot/600/2 "2017-01-03T14:06:25Z")
There are noise figure and gain plots for LNAL and LNAH inputs:
> [@RF connection: 10 U.FL connectors (6 RX, 4 TX)?](https://discourse.myriadrf.org/t/rf-connection-10-u-fl-connectors-6-rx-4-tx/305/50):
>
> Currently we are using components on LNA inputs to fine tune for some cellular bands. On the final version of the LimeSDR we shall match the receivers for the optimum broadband performance as shown in the pictures below:
Not sure about impedance vs. frequency for inputs and outputs.
Perhaps @RicardasVadoklis or @Ignas might know.
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### Author:  [@Kc7noa](https://discourse.myriadrf.org/u/Kc7noa)
#### Post date: [24 September 2018 00:12 UTC](https://discourse.myriadrf.org/t/input-output-inpedance-vs-frequency-chart-plot/600/3 "2018-09-24T00:12:05Z")
Images are not showing up anymor…
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### Author:  [@Kc7noa](https://discourse.myriadrf.org/u/Kc7noa)
#### Post date: [24 September 2018 03:38 UTC](https://discourse.myriadrf.org/t/input-output-inpedance-vs-frequency-chart-plot/600/5 "2018-09-24T03:38:50Z")
And never did get a response … i assume 50ohm … but i dont like to assume